Answer:
Explanation:
An element with atomic number 18 is a noble gas.
The element with atomic number 19 will have one extra electron so it can donate one electron or shed one electron to attain noble gas configuration .
It tends to shed one electron to become positively charged ion . Hence they are electro-positive elements .
Similarly the element with atomic number 17 will have one short electron so it can gain one electron to attain noble gas configuration .
They tend to gain one electron to become negatively charged ion . Hence they are electro-negative elements . They have high electronegativity .
Mendel also developed the law of
dominance. He did many experiments
with pea plants. This is how he came
up with the law. It shows how certain
traits come to be. One allele is
dominant. It exerts a greater influence.
He based this on an uncertain belief
that each plant carried two trait units.
One of them dominated the other.
Which sentence from this paragraph explains what a dominant allele does?
A. Mendel also developed the law of dominance
B. He did many experiments with pea plants
C. It exerts a greater influence
D. He based this on an uncertain belief that each plant carried two traits
Answer:
They mask the recessive alleles
Convert from: 689 m =____mm*
(Metric Conversion chart)
A. 68,900 mm
B. 689,000 mm
C. 0.689 mm
D. 0.000689 mm
Answer:
b) 689,000mm
as 1m= 1000mm
Answer:
A
Explanation:
mark me brainlisted please
What is the electron configuration for iron?
Answer:
1s2 2s2 2p6 3s2 3p6 4s2 3d6
Explanation:
PLEASE HELP ME I WILL LOVE U FOREVER
Answer:
according to me option a is the correct one
At 7 a.m., the science classroom had a temperature of 68˚F. By 3 p.m., the temperature had increased to 75˚F. Calculate the rate of temperature change from 7 a.m. to 3 p.m.
Hai!
I believe it would have to be 2.3.
Brainliest maybe?
Which process has the greatest potential for genetic variability?
A.
cell differentiation
B.
interkinesis
C.
meiosis
D.
mitosis
E Zora wants to dissolve a solute in a solvent quickly. Which best describes what she should do? O decrease the pressure O decrease the surface area O shake it repeatedly O place in a refrigerator Mark this and return Save and Exit Next.
Answer:
c
Explanation:
By dissolving a solute in a solvent, a solution can be formed. To dissolve the solute in the solvent quickly, the solution must be shaken well. Thus option A is correct.
What is a solution?A solution is a substance formed by a solid solute in a solvent. The solution can be of homogeneous or hetreogenous. A homogenous solution is the one where the solute completely dissolve in the solvent and both the solvent and solute are in one phase.
In heterogenous solution, the solute and solvent are in two different phases due to the incomplete solubility of the solute. The solubility of a solute depends on the bond type of both solvent and solute, weight of solute, temperature and pressure as well mixing mode by shaking.
Some times heating the solution can be a good way to increase the solubility and quick dissolving. Where, the solute-solute interaction decreases and solvent-solute interaction increases.
Similarly, shaking thoroughly will make the solute easily dissolve. Hence, option A is correct.
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Why is it dangerous to produce carbon dioxide in a closed container?
Please someone answer it’s due soon, and if you can get into detail with the answer
Which of the following halogens has the largest atomic radius?
a. Chlorine
b. lodine
c. Bromine
d. Fluorine
Answer:
[tex]\boxed {\boxed {\sf B. \ Iodine }}[/tex]
Explanation:
Atomic radius is the measurement from the nucleus to the outer edge of the electron cloud.
As you go down a group (vertically) the atomic radius increases because more electron shells are added. As you go across a period horizontally, the atomic radius decreases.
If we look at the halogens group (17), we see they follow this order from top to bottom:
F - Fluorine
Cl - Chlorine
Br - Bromine
I - Iodine
Since it increases down the group, iodine must have the largest atomic radius.
What mass of Cl2 can be produced at STP when 3.3 moles of HCl are reacted with excess MnO2?
Help PLs thnk you!!!!!!!!!!!!!!!!!!!!!!!!
Which is the chemical formula for a dinitrogen trioxide molecule?
A. SN2O
B. 2N3O2
C. NO3
D. N2O3
Answer:
The Answer would be D. N2O3
Explanation:
the Chemical bond is a Covalent bond to which the prefixes are Di and tri
What does this weather map symbol represent
A) moving front
B) stationary front
C) cold front
D) warm front
Answer:
B
Explanation:
Blue triangles are a cold front and red bowls are warm front
Stationary front is a combination
HOPE I helped :]
Answer:
stationary front
Explanation:
on a weather map, a stationary front is shown as alternating red semicircles and blue triangles like in the image at the left. notice how the blue triangles point in one direction, and the red semicircles point in the opposite direction.
What holds all the planets and objects in the solar system in place?
Where does it come from?
Answer:
Gravity
Explanation:
i dont rlly know where it comes from...
4. (10 Points) Why would a mixture of gases in a 5 L balloon react faster than a
mixture of the same gases in a 10 L balloon?
Answer:
There is more space in a balloon with less gases meaning it can move around a lot faster
Explanation:
4. Which chemical formula below contains 2
different elements?
A. CO
B. Fe2O3
C. C2H4
D. All of the above
The chemical formula of CO, Fe₂O₃, and C₂H₄ contain atoms of two different elements. Therefore, option (D) is correct.
What is the chemical formula?A chemical formula provides information about the chemical proportions of atoms of each element that are present in a molecule or chemical compound. The chemical formula can be represented by using chemical symbols of elements, numbers (subscripts), and other symbols, such as commas, dashes, brackets, and plus (+) and minus (−) signs.
A chemical formula of a compound has no words but can be written in certain simple chemical structures. Chemical formulae can be more limited in power than chemical names and structural formulae. There are two kinds of chemical formulas in which one empirical formula and another molecular formula.
In the chemical formula of carbon monoxide (CO) has carbon and oxygen two different elements. In the chemical formula of iron oxide (Fe₂O₃) iron and oxygen are two different elements. In the chemical formula of ethane (C₂H₄ ) has carbon and hydrogen two different elements.
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i need this asap will give brainliest
Answer:
Explanation:
42.32
Hope this helps sorry if wrong
All the elements in group 1 react with water to form a hydroxide. What other substance is also
produced?
Cold water causes a strong reaction between all alkali metals. Each reaction results in the release of hydrogen gas and the production of metal hydroxide.
What are alkali metals ?The six chemical elements that make up Group 1 ( Ia ) of the periodic table—lithium ( Li ), sodium ( Na ), potassium ( K ), rubidium ( Rb ), cesium ( Cs ), and francium—are together referred to as alkali metals ( Fr ). The name "alkali metals" refers to how they react with water to produce alkalies.
The elements in Group 1 are all extremely reactive. To protect them against air and water, they must be kept under oil when being stored. Group 1 elements produce alkaline metal hydroxides when they interact with water (with a pH above 7). They are known as "alkali metals" for this reason.
Thus, the elements in group 1 react with water to form a hydroxide and hydrogen gas is produced.
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brainiest plsss helpp
Answer:
[tex]\boxed {\boxed {\sf A. \ 19,320 \ kg/m^3}}[/tex]
Explanation:
We want to find the density. The formula is mass over volume.
[tex]\rho = \frac{m}{v}[/tex]
The mass is 500 kilograms. The volume is 0.026 cubic meters.
[tex]m= 500 \ kg \\v=0.026 \ m^3[/tex]
Substitute the values into the formula.
[tex]\rho= \frac{ 500 \ kg}{ 0.026 \ m^3}[/tex]
Divide.
[tex]\rho = 19230.7692 \ kg/m^3[/tex]
This is just about equal to 19,320 kg/m³, so choice A is correct.
Answer:
A) 19230 kg/ m3
Explanation:
divided it's mass by its volume ti get it's density
500/0.026 = 19230
Which of the following elements exists as a diatomic element?
Neon
Aluminum
Lithium
Nitrogen
Answer:
Nitrogen
Explanation:
because a rule i use called the "en,ne" rule
Any element that ends with this is diatomic
Please i need help with this question.
Please show workings where necessary and proof/ explain your point
Answer:
C
Explanation:
Please see the attached picture for the explanation.
Le Châtelier's principle:
When a stress is applied to a system at equilibrium, the system will respond by shifting in the direction that opposes/ minimizes the effect of the stress.
• This stress could be the addition or removal of a product or reactant, changes in the concentration of the products or reactants, or a change in temperature.
☆ Why can heat be written on the same side of the products when the reaction is exothermic?
• Exothermic means that heat is released, thus heat can be treated as a product.
• I like to remember it as Exothermic → Exit
I need to talk to a boy please ?
A male construction worker regularly consumes 18 000 kJ of energy per day. Suggest the effects this could have on his health.
Answer:
It could lead to Fatigue
Low energy.
Headaches.
Aches, pains, and tense muscles.
Chest pain and rapid heartbeat.
Explanation:
If a construction worker consumes 18000 KJ of energy on a daily basis, this could lead to adverse effects such as fatigue, headaches, aches, tense muscles, chest pain, and rapid heartbeat.
What are the energy requirements for a construction worker?
The NHS advises a man who is working at a construction site to eat 2,500 calories, and women to eat 2,000 calories, on daily basis. On an average, construction workers such as women should have around 2,000 calories a day which carries about 8,400 kilojoules and men should have around 2,500 calories a day which is about 10,500 kilojoules.
The best diet for a construction worker include foods such as grain, vegetable, fruit, dairy product, lean meat, seed, and fats for the maintenance of a healthier condition.
If a construction worker is taking 18000 KJ of energy in diet which is almost 8000 KJ more than the required amount then in this case, the worker may have fatigue, headaches, aches, tense muscles, chest pain, and rapid heartbeat.
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balance Na20+H20--> NaOH
Answer:
2NaOH
Explanation:
can you pleasehelp me on this
Answer: Trade winds!
Explanation:
Fossils can be body parts of ancient organisms, or they can be traces. Give five examples of traces. Help this is due today!!!!!7 grade
Burrows, tracks, coprolites, nests and footprints are examples of traces that can be found in a fossil.
Given the following Equation: _N2 + _H2 --> _NH3
How many grams of ammonia can be produced from 3.5 moles of nitrogen?
A)119g
B)247g
C)59.5g
D)45.5g
Which element would form a Covalent (Molecular) bond with Hydrogen (H)?
Answer:
Fluorine
Explanation:
Answer:
Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom.
1. Which of the following is an Environmental Issue?
(1 Point)
Land Pollution
Water Quality
All of the Above
Answer:Land Population
How does a buffer work?
O A. It prevents added acids or bases from dissociating.
O B. It forms new conjugate pairs with the added ions.
O C. It neutralizes acids or bases by precipitating a salt.
O D. It bonds with the added H+ or OH in solution.
Answer: O D. It bonds with the added H+ or OH in solution.
Explanation: